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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.runtime
import Predef._
/* The object <code>ScalaRunTime</code> provides ...
*/
object ScalaRunTime {
/** Names for primitive types, used by array unboxing */
val ByteTag = ".Byte"
val ShortTag = ".Short"
val CharTag = ".Char"
val IntTag = ".Int"
val LongTag = ".Long"
val FloatTag = ".Float"
val DoubleTag = ".Double"
val BooleanTag = ".Boolean"
def isArray(x: AnyRef): Boolean =
(x != null && x.getClass.isArray) || (x != null && x.isInstanceOf[BoxedArray])
def isValueTag(tag: String) = tag.charAt(0) == '.'
def isValueClass(clazz: Class) = clazz.isPrimitive()
def checkInitialized[T <: AnyRef](x: T): T =
if (x == null) throw new UninitializedError else x
abstract class Try[A] {
def Catch[B >: A](handler: PartialFunction[Throwable, B]): B
def Finally(handler: Unit): A
}
def Try[A](block: => A): Try[A] = new Try[A] with Runnable {
var result: A = _
var exception: Throwable = ExceptionHandling.tryCatch(this)
def run() { result = block }
def Catch[B >: A](handler: PartialFunction[Throwable, B]): B =
if (exception eq null)
result.asInstanceOf[B]
// !!! else if (exception is LocalReturn)
// !!! // ...
else if (handler isDefinedAt exception)
handler(exception)
else
throw exception
def Finally(handler: Unit): A =
if (exception eq null)
result.asInstanceOf[A]
else
throw exception
}
def caseFields(x: Product): List[Any] = {
val arity = x.productArity
def fields(from: Int): List[Any] =
if (from == arity) List()
else x.productElement(from) :: fields(from + 1)
fields(0)
}
def _toString(x: Product): String =
caseFields(x).mkString(x.productPrefix + "(", ",", ")")
def _hashCode(x: Product): Int = {
var code = x.getClass().hashCode()
val arr = x.productArity
var i = 0
while (i < arr) {
code = code * 41 + x.productElement(i).hashCode()
i += 1
}
code
}
def _equals(x: Product, y: Any): Boolean = y match {
case y1: Product if x.productArity == y1.productArity =>
val arity = x.productArity
var i = 0
while (i < arity && x.productElement(i) == y1.productElement(i))
i += 1
i == arity
case _ =>
false
}
def _equalsWithVarArgs(x: Product, y: Any): Boolean = y match {
case y1: Product if x.productArity == y1.productArity =>
val arity = x.productArity
var i = 0
while (i < arity - 1 && x.productElement(i) == y1.productElement(i))
i += 1
i == arity - 1 && {
x.productElement(i) match {
case xs: Seq[_] =>
y1.productElement(i) match {
case ys: Seq[_] => xs sameElements ys
}
}
}
case _ =>
false
}
//def checkDefined[T >: Null](x: T): T =
// if (x == null) throw new UndefinedException else x
def Seq[A](xs: A*): Seq[A] = null // interpreted specially by new backend.
def arrayValue(x: BoxedArray, elemTag: String): AnyRef =
if (x eq null) null else x.unbox(elemTag)
def arrayValue(x: BoxedArray, elemClass: Class): AnyRef =
if (x eq null) null else x.unbox(elemClass)
def boxArray(value: AnyRef): BoxedArray = value match {
case x: Array[Byte] => new BoxedByteArray(x)
case x: Array[Short] => new BoxedShortArray(x)
case x: Array[Char] => new BoxedCharArray(x)
case x: Array[Int] => new BoxedIntArray(x)
case x: Array[Long] => new BoxedLongArray(x)
case x: Array[Float] => new BoxedFloatArray(x)
case x: Array[Double] => new BoxedDoubleArray(x)
case x: Array[Boolean] => new BoxedBooleanArray(x)
case x: Array[AnyRef] => new BoxedObjectArray(x)
case x: BoxedArray => x
}
}
|
